Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
SECRETS OF THE OLD PAINTER
Usually on the surface of stored paint forms a film or crust, when removed often remain in the container its particles: once on the brush, they can spoil the work. Take the time to look...
PIPE FOR GAS BOILER
"Shoemaker without shoes" — this old Russian proverb current to this day. All of Europe has long been use Russian gas, and in the houses of the population, even gas producing regions of...
